Machine for beveling notches in coulter disks



Dec. 12, 1950 F. w. BARBKNECHT 2,533,756

MACHINE FOR BEVEILING NOTCHES IN COULTER DISKS Filed OCC. 5, 1948 2 Sheets-Sheet 1 bugg- Dec. 12, 1950 F. w. BARBKNECHT 2,533,756

MACHINE FOR BEVELING NOTCHES IN COULTER DISKS Filed OCT.. 5, 1948 2 Sheets-Sheet 2 Patented Dec. 12, V 1950 MACHINE FOR BEVELING NOTCHES IN COULTER DISKS Fred W. Barbknecht, Palos Heights, Ill., assignerv to International Harvester Company, a corporation of New Jersey Application October 5, 1948, Serial No. 52,927

(Cl. 76H82) 3 Claims. l

This invention relates to an improved production machine for lbeveling the edges of discs. More particularly it relates to a machine for beveling edges of a, disc having circumferentially spaced notches.

In the agricultural industry a large number of steel discs are used in Various of the farm operations. In some instances the discs are concavoconvex in shape and this type of disc is generally used in a farm implementl of the disc harrow type. The discs function to break the clods of soil as the machine goes over the freshly plowed ground. Likewise, a great many flat discs are used in connection with plowing operations. Discs of this type are generally referred to as coulter discs. These discs are also generally provided with circumferentially extending notches. The material of the discs yadjacent and bordering the notches is generally beveled to provide 'a sharpened surface thereby facilitating the breaking up of the clods of soil. Many of these discs are used in the industry and a high replacement factor makes high production of the discs desirable. In the past the sharpening operation generally has been accomplished by means of an abrading machine, such as a grinder, wherein the operator held the disc up against the wheel of the grinder to sharpen or bevel the edges of the material adjacent the notched Aout portions.

This type of operation was slow and tedious and a uniform sharpening operation did not result. In some cases the metal would be burned land thus the sharpened edges of the disc would rapidly deteriorate under operating conditions.

It is the prime object of this invention to pro- Other objects will become more readily appar- `ent upon an examination of the specification land drawings.

In the drawings:

Fig. 1 is a cross-sectional view through a fixture and machine for sharpening or bevellng the y edges of concavo-convex discs. v

Fig. 2 is a fragmentary view of a pair of concavo-convex discs positioned in opposed relation.

Fig. 3 is a cross-sectional View through a concavo-convex disc showing a, cutter positioned adjacent thereto.

Fig. 4 is a cross-sectional view through a modiiied fixture or machine for beveling the edges of coulter discs. l

Fig. 5 is a perspective view of a disc sharpening machine placed in operating connectionY with a power machine. f

Referring particularly to Figs. 1, 2 Iand 3, a machine or apparatus for treating and sharpening discs is generally designated by the reference character I0. The machine I 0 includes a fixture or support Il which may be suitably formed of cast material. The support I'I Vincludes a centrally positioned projection I2 which is provided with a vertically extending bore I3. The bore I3 is arranged to position a bearing member I4 in axial relation. The upper portion of the'support II includes a pair of opposed angularly extending portions I5. The portions I5 include downwardly extending projections I6, each of which is provided with a bore I'I. The bores I'I extend upwardly and outwardly in diverging relation with respect to the bore I3. A shaft I8 is rotatable Within each bore I'I. The shaft |13 includes at its lower end a bevel gear I9 'which is rigidly secured to the shaft for rotating the same. The upper `end of each shaft I8 is provided with a turntable 20 rigidly secured to the shaft for rotation therewith. 'Ihe turntable 20 is positioned in angular relation with respect to the bore I3, and also includes an upper convex surface 2|. v

Positioned at opposite sides of the bore I3 and cooperating with the turntables 20 are work holders or clamps generally designated by the reference character 22. The -work holders 22 are supported on brackets 23 extending upwardly from the fixture I I. The work holders 22 are also provided with guide members 24 through which a plunger 25 reciprocates. Each plunger 25` includes a coll-ar 25 rigidly secured to the plunger and engaging a spring 2'I.4 The spring 2'I normally urges the plunger 25 upwardly. A projection 28 extends upwardly from each bracket 23. The projections 28 are arranged to rotatably support handle members 29. AThe handle members 29 include cam surfaces 39. The cam surfaces 3i] lare arranged to engage and effect movement of the plunger 25 upon rotation of the handle members 29. The lower ends of the plungers 25 .are provided with cup shaped members 3|. The

cup shaped members 3l are rotatable on an undercut shaft extension 32 projecting downwardly from the ends of the plungers 25.

Upon downward movement of the plungers 2t during actuation of the handle members 2Q, the

cup shaped members 3l engage upper convex surfaces of `concavo-convex discs 33. As best shown -in Figs. 1 and 2, the discs are provided with circumferentially extending notches 34. The discs are also provided with edges 35 which border the notches 34. It is these edges 3 5 that are treated and beveled by the operation oiv the machine I0.

A cutter head 36 is positioned between the' work holders 22 and the discs 33, as best shown* in Fig. 1. The cutter head 3S may be of a conventional mill type of cutter and consists of an extension 3'! which projects and is journalled within the bearing lll. The cutter head 38 also includes an upwardly extending shaft 33 which lis'rotatable in'a bore 33 formed'in a bracket fit. V'lhecutte'r head also includes conventional type cutting edges 36'. Collars 38' are rigidly secured Vto the shaft 38, the collars normally resting on Wheel The ratchet wheel sais rota-cec by means ofa pawl @il which may be moved by means o f a link 45. y f

machine i() above described is'generally `utilized vfor sharpening jtheedg'es oi concaveconvex type of discs'. The turntablesi are Iso 'shaped as to receive the concave surfaces of the dscs. 1n Figs. 4 and 5 a modified form o the finvention is shown. In these figures a machine .5E ofsimilar design is shov/n adaptedto sharpen coulter type discs, these discs being of flat construction. A Viixture or support is generally designated by the reference character 5t. The sup- .port 5l includes supporting surfaces 52 which are provided with vertically extending bores, 53. Shafts .54 are adapted to be rotated in thebores '53 by means of gearsbii. vThe-upper ends of the shafts iare secured to tables 55 ior rotating the A pair of flat Coulter discs 57 areshown in po- .sition on the tables 56. The coulters include cir.-

cumferentially extending notches 53 and edges ttbordering or adjacent said notches. Bolts 6) securely vrnount the discsl 5l to thetables i vfor rotation therewith. The gear 5l is in meshing engagement with both of the gears 55. The gear 3i is rotated bymeans of a shaft 62V Which, in turn, is rotated by a ratchet wheel S3. The vratchet wheei is turnedbya-pawl M attached .to a pivotal link 651 arrangedtorreciprocate the v. 1A support iextends upwardly v fromthe .ture di. The support 65 includesabore--fi which is positioned centrally between the edges oi the 4-coulter ,discs 5l. A cutterhead 6331s adapted to rota-te Within-the'bore E1. g The Cutter fheadis :similar to the head 36 andincludes'cutting edges 6 9.- A shaft 'it extends upwardly from 'thercutter head `EB and into a driving or rotatable-niember1 3.y Ajv pair'of-collars 'Il' are rigidly secured vertically and are normally utilized for limiting the downward position of the cutter head 68.

A pair of spaced arms 'I4 are adapted to engage the underneath sides of the collars 'Il for raising and lowering the cutter head with respect to the edges of the Coulter discs. In Fig. 1 the spaced arms 14 function ina similar manner for engagingthe underneath portions of the collars 38' for raising and lowering the cutter head 33. It is to be understood that the shafts 38 and 'I0 engage the driving member 'i3 in vertically reciprocating relation so that the shafts may be adjusted vertically with respect to the member-'13.v j

As `best' shown in Fig. 5, the machine 50 is positioned on abolster plate '16. The underneath .portion of the fixture 5| may be provided with dovetail lock members Ti adapted to engage notches in the bolster 'It in a well-known manner.

Itis, Voi course, understood thatthe machine 5B may be utilized withany type of powermeans vadapted-to impart rotating moveeither of the cutter heads 36 0r 68.

-In the operation o the machine shown iu Fig.

the concayconvex discs 33- eresecurelycom .nected tothe turntables 23 by means of thecol- .lars si `whiclfi are pressed into engagement .with

thefcppersuriaceso thev discs. The cams 33 on the handles 23 -securely position the collars vagainstthe upper surfaces of the discs. VThe cutter-head isthereupon lowered into an annular .space formed by opposed edges bordering a pair oroppcsed notchesv 34. After the head it .has been lowered the driving member i3 lis set into rotating motion whereupon thecutting edges 35 ci the head 33 operate to work against the edges 35 bordering the notches 34. r The cutter headft 'removes material, thus beveling theedges oi the ldisc 33 asbest shown in Figs. 2 and 3. After-the edges 'have thus been beveled the cutter head l36 50 is 'rais-ed and the shaft i2 is thereupon rotated, thusimparting rotating movement to the gears i'S-and-shafti for rotating the turntable-2i). AS

the turntables 2tA are thus. rotated, the discs 3 3 are moved so that successive untreated edges '3 5 of the discs are indexed adjacent the cutter head B whereupon the cutter head 33 is again lowered and thecycle of operation is repeated..

In the modied construction shown in Fig.

`c.'thefoperatio'n is--similar- In this showing the lturntables 53 may be :indexedI and rotated by the shaft 52 whereupon opposed notches t8 vare lined up adjacent the cutter head 68, The cutter head-,S58 is thereunon'lowered against the edges 59 :for bcveling or sharpening; the same, When the 5.65 'l' -beadgis againraised andthe cyclejoi .operation is fr'epeatedin .the samegmanner in the operation edgesjihaveI been suiciently treated the cutter shown in Fig. 1.

.1; fn can thus bessen that shovel naa-'chine and :nxturef for bevelmg the edgeaofcoulter discs whereupon eicient and uniform bei/cling Aand Sharpening is 'ffeetedq It; muette, undesired The bolster plate I5 in this instance is -shownaspart of e power machine such as a drill press i8.

that only preferred embodiments of the invention have been shown and that changes and modification may be made which do not depart from the spirit of the invention nor the scope thereof as deiined in the appended claims.

What is claimed is:

1. In a machine for treating a concavo-convex disc having circumferentially spaced notches, a supporting structure having a centrally disposed vertically extending bore, a bearing member positioned in the bore, a pair of work holding elements disposed at opposite sides of the vertically extending bore, each of said elements including a rotatable shaft, each shaft extending upwardly and outwardly with respect to the bore, a turntable connected to each shaft for rotation therewith, each turntable being positioned in angular relation with respect to the bore and having a convex surface adapted to receive a concavoconvex disc, a pair of clamps for removably securing a discv to each turntable, each clamp including an axially shiftable member having a rotatable cup shaped element arranged to be moved into engagement with a disc, a cutter head positioned between the turntables, said head including a shaft extension journalled within the bearing member of the bore, a shaft extending upwardly from the cutter head and adapted to engage a driving member in reciprocating and driving relation, means for axially moving said cutter head adjacent the notches of a pair of discs and into cutting engagement with edges bordering the notches of the discs for sharpening the edges, and means for rotating said turntables thereby successively moving unsharpened edges of the discs into position for engagement by the y a concavo-convex disc, a pair of clamp structures` for securing the discs to the turntables, each clamp structure comprising an axially shiftable member, a support for the shiftable member, said support including a guide member for supporting the shiftable member in reciprocating relation, a spring connected to said shiftable member for urging said member in a direction away from said turntable, a cam member connected to said support, said cam member being movable for shifting said shiftable member against the action of said spring toward said turntable, a rotatable cup-shaped element connected to said shiftable member and adapted to be moved into engagement with a concavo-convex disc for securing the same on the turntable, a cutter head positioned between the turntables, said head including a shaft extension journalled within the bore, means for rotating said cutter head, means for axially moving said cutter head adjacent the notches of the discs mounted on the turntables and into cutting engagement with edges bordering the notches of the discs for sharpening the edges, and means for rotating said turntables thereby successively moving unsharpened edges of the discs into position for engagement by the cutter head.

3. In a machine for sharpening the edges of a disc comprising a supporting structure having a centrally disposed cutter support, said cutter support including an axially extending bore, a cutter head axially shiftable in said bore, said cutter head including an upwardly extending shaft adapted to engage a driving member in reciprocating relation, a pair of vertically extending bearing members disposed at opposite sides of the cutter head on said supporting structure, a shaft journalled in each bearing member, means for connecting a disc to each shaft for rotation therewith, means for axially shifting said cutter head into cutting engagement with the discs, means for rotating said discs, said means including a driven gear connected to each shaft for rotating the same, a drive gear supported on the supporting structure, said drive gear being in meshing engagement with the driven gears, and means connected to said drive gear for intermittently rotating the same thereby successively indexing unsharpened edges of said discs into position for cutting engagement by said cutter head.

FRED W. BARBKNECHT.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS' Number Name Date 120,433 Hawkins Oct. 3l, 1871 1,352,324 Strain Sept. '7, 1920 1,487,589 Miner et al. Mar. 18, 1924 1,635,491 Milliken July 12, 1927 2,082,832 Hansen June 8, 1937 2,353,131 Ford July 11, 1944 2,401,486 Jones June 4, 1946 

